对具有共同实例变量的各种对象的ArrayList进行排序

import java.util.ArrayList;
import java.util.Collections;

public class Main {
    public static void main(String[] args) {
        // 创建一个存放对象的ArrayList
        ArrayList<Person> personList = new ArrayList<>();

        // 添加对象到ArrayList中
        personList.add(new Person("Alice", 25));
        personList.add(new Person("Bob", 30));
        personList.add(new Person("Charlie", 20));

        // 对ArrayList中的对象进行排序
        Collections.sort(personList);

        // 打印排序后的结果
        for (Person person : personList) {
            System.out.println(person.getName() + " - " + person.getAge());
        }
    }
}

class Person implements Comparable<Person> {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    @Override
    public int compareTo(Person otherPerson) {
        // 根据年龄进行排序
        return Integer.compare(this.age, otherPerson.age);
    }
}